*{
    margin: 0;
    padding: 0;
}
html{
    background-color: aqua;
    width: 100%;
    height: 100%;
    font-size: 10px;
}
body{
    margin: 0;
    font-size: 2rem;
    display: flex;
    flex: 1;
    min-height: 100vh;
    justify-content: center;
}

.clock{
    width: 30rem;
    height: 30rem;
    border: 20px solid #ffffff;
    border-radius: 50%;
    margin: 50px auto;
    position: relative;
    padding: 2rem;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.3)
}

.clock-face{
    position: relative;
    width: 100%;
    height: 100%;
    transform: translateY(-3px);
}

.hand{
    width: 50%;
    height: 6px;
    background-color: black;
    position: absolute;
    top: 50%;
    /* 定义动画的基点 */
    transform-origin: 100% 50%;
    transform: rotate(90deg);
    transition: all 0.05s;
    transition-timing-function: cubic-bezier(0.1,2.7,0.58,1);
}